drivers/tty/mxser.c

   1 /*
   2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
   3  *
   4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
   5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
   6  *
   7  *      This code is loosely based on the 1.8 moxa driver which is based on
   8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
   9  *      others.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
  17  *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
  18  *      www.moxa.com.
  19  *      - Fixed x86_64 cleanness
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/timer.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/serial.h>
  31 #include <linux/serial_reg.h>
  32 #include <linux/major.h>
  33 #include <linux/string.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/ptrace.h>
  36 #include <linux/ioport.h>
  37 #include <linux/mm.h>
  38 #include <linux/delay.h>
  39 #include <linux/pci.h>
  40 #include <linux/bitops.h>
  41 #include <linux/slab.h>
  42 #include <linux/ratelimit.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <linux/uaccess.h>
  47
  48 #include "mxser.h"
  49
  50 #define MXSER_VERSION   "2.0.5"         /* 1.14 */
  51 #define MXSERMAJOR       174
  52
  53 #define MXSER_BOARDS            4       /* Max. boards */
  54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
  55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
  56 #define MXSER_ISR_PASS_LIMIT    100
  57
  58 /*CheckIsMoxaMust return value*/
  59 #define MOXA_OTHER_UART         0x00
  60 #define MOXA_MUST_MU150_HWID    0x01
  61 #define MOXA_MUST_MU860_HWID    0x02
  62
  63 #define WAKEUP_CHARS            256
  64
  65 #define UART_MCR_AFE            0x20
  66 #define UART_LSR_SPECIAL        0x1E
  67
  68 #define PCI_DEVICE_ID_POS104UL  0x1044
  69 #define PCI_DEVICE_ID_CB108     0x1080
  70 #define PCI_DEVICE_ID_CP102UF   0x1023
  71 #define PCI_DEVICE_ID_CP112UL   0x1120
  72 #define PCI_DEVICE_ID_CB114     0x1142
  73 #define PCI_DEVICE_ID_CP114UL   0x1143
  74 #define PCI_DEVICE_ID_CB134I    0x1341
  75 #define PCI_DEVICE_ID_CP138U    0x1380
  76
  77
  78 #define C168_ASIC_ID    1
  79 #define C104_ASIC_ID    2
  80 #define C102_ASIC_ID    0xB
  81 #define CI132_ASIC_ID   4
  82 #define CI134_ASIC_ID   3
  83 #define CI104J_ASIC_ID  5
  84
  85 #define MXSER_HIGHBAUD  1
  86 #define MXSER_HAS2      2
  87
  88 /* This is only for PCI */
  89 static const struct {
  90         int type;
  91         int tx_fifo;
  92         int rx_fifo;
  93         int xmit_fifo_size;
  94         int rx_high_water;
  95         int rx_trigger;
  96         int rx_low_water;
  97         long max_baud;
  98 } Gpci_uart_info[] = {
  99         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
 100         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
 101         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
 102 };
 103 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
 104
 105 struct mxser_cardinfo {
 106         char *name;
 107         unsigned int nports;
 108         unsigned int flags;
 109 };
 110
 111 static const struct mxser_cardinfo mxser_cards[] = {
 112 /* 0*/  { "C168 series",        8, },
 113         { "C104 series",        4, },
 114         { "CI-104J series",     4, },
 115         { "C168H/PCI series",   8, },
 116         { "C104H/PCI series",   4, },
 117 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
 118         { "CI-132 series",      4, MXSER_HAS2 },
 119         { "CI-134 series",      4, },
 120         { "CP-132 series",      2, },
 121         { "CP-114 series",      4, },
 122 /*10*/  { "CT-114 series",      4, },
 123         { "CP-102 series",      2, MXSER_HIGHBAUD },
 124         { "CP-104U series",     4, },
 125         { "CP-168U series",     8, },
 126         { "CP-132U series",     2, },
 127 /*15*/  { "CP-134U series",     4, },
 128         { "CP-104JU series",    4, },
 129         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
 130         { "CP-118U series",     8, },
 131         { "CP-102UL series",    2, },
 132 /*20*/  { "CP-102U series",     2, },
 133         { "CP-118EL series",    8, },
 134         { "CP-168EL series",    8, },
 135         { "CP-104EL series",    4, },
 136         { "CB-108 series",      8, },
 137 /*25*/  { "CB-114 series",      4, },
 138         { "CB-134I series",     4, },
 139         { "CP-138U series",     8, },
 140         { "POS-104UL series",   4, },
 141         { "CP-114UL series",    4, },
 142 /*30*/  { "CP-102UF series",    2, },
 143         { "CP-112UL series",    2, },
 144 };
 145
 146 /* driver_data correspond to the lines in the structure above
 147    see also ISA probe function before you change something */
 148 static const struct pci_device_id mxser_pcibrds[] = {
 149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
 150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
 151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
 152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
 153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
 154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
 155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
 156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
 157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
 158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
 159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
 160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
 161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
 162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
 163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
 164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
 165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
 166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
 167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
 168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
 169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
 170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
 171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
 172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
 173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
 174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
 178
 179 static unsigned long ioaddr[MXSER_BOARDS];
 180 static int ttymajor = MXSERMAJOR;
 181
 182 /* Variables for insmod */
 183
 184 MODULE_AUTHOR("Casper Yang");
 185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
 186 module_param_hw_array(ioaddr, ulong, ioport, NULL, 0);
 187 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
 188 module_param(ttymajor, int, 0);
 189 MODULE_LICENSE("GPL");
 190
 191 struct mxser_log {
 192         int tick;
 193         unsigned long rxcnt[MXSER_PORTS];
 194         unsigned long txcnt[MXSER_PORTS];
 195 };
 196
 197 struct mxser_mon {
 198         unsigned long rxcnt;
 199         unsigned long txcnt;
 200         unsigned long up_rxcnt;
 201         unsigned long up_txcnt;
 202         int modem_status;
 203         unsigned char hold_reason;
 204 };
 205
 206 struct mxser_mon_ext {
 207         unsigned long rx_cnt[32];
 208         unsigned long tx_cnt[32];
 209         unsigned long up_rxcnt[32];
 210         unsigned long up_txcnt[32];
 211         int modem_status[32];
 212
 213         long baudrate[32];
 214         int databits[32];
 215         int stopbits[32];
 216         int parity[32];
 217         int flowctrl[32];
 218         int fifo[32];
 219         int iftype[32];
 220 };
 221
 222 struct mxser_board;
 223
 224 struct mxser_port {
 225         struct tty_port port;
 226         struct mxser_board *board;
 227
 228         unsigned long ioaddr;
 229         unsigned long opmode_ioaddr;
 230         int max_baud;
 231
 232         int rx_high_water;
 233         int rx_trigger;         /* Rx fifo trigger level */
 234         int rx_low_water;
 235         int baud_base;          /* max. speed */
 236         int type;               /* UART type */
 237
 238         int x_char;             /* xon/xoff character */
 239         int IER;                /* Interrupt Enable Register */
 240         int MCR;                /* Modem control register */
 241
 242         unsigned char stop_rx;
 243         unsigned char ldisc_stop_rx;
 244
 245         int custom_divisor;
 246         unsigned char err_shadow;
 247
 248         struct async_icount icount; /* kernel counters for 4 input interrupts */
 249         int timeout;
 250
 251         int read_status_mask;
 252         int ignore_status_mask;
 253         int xmit_fifo_size;
 254         int xmit_head;
 255         int xmit_tail;
 256         int xmit_cnt;
 257         int closing;
 258
 259         struct ktermios normal_termios;
 260
 261         struct mxser_mon mon_data;
 262
 263         spinlock_t slock;
 264 };
 265
 266 struct mxser_board {
 267         unsigned int idx;
 268         int irq;
 269         const struct mxser_cardinfo *info;
 270         unsigned long vector;
 271         unsigned long vector_mask;
 272
 273         int chip_flag;
 274         int uart_type;
 275
 276         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
 277 };
 278
 279 struct mxser_mstatus {
 280         tcflag_t cflag;
 281         int cts;
 282         int dsr;
 283         int ri;
 284         int dcd;
 285 };
 286
 287 static struct mxser_board mxser_boards[MXSER_BOARDS];
 288 static struct tty_driver *mxvar_sdriver;
 289 static struct mxser_log mxvar_log;
 290 static int mxser_set_baud_method[MXSER_PORTS + 1];
 291
 292 static void mxser_enable_must_enchance_mode(unsigned long baseio)
 293 {
 294         u8 oldlcr;
 295         u8 efr;
 296
 297         oldlcr = inb(baseio + UART_LCR);
 298         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 299
 300         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 301         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
 302
 303         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 304         outb(oldlcr, baseio + UART_LCR);
 305 }
 306
 307 #ifdef  CONFIG_PCI
 308 static void mxser_disable_must_enchance_mode(unsigned long baseio)
 309 {
 310         u8 oldlcr;
 311         u8 efr;
 312
 313         oldlcr = inb(baseio + UART_LCR);
 314         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 315
 316         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 317         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
 318
 319         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 320         outb(oldlcr, baseio + UART_LCR);
 321 }
 322 #endif
 323
 324 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
 325 {
 326         u8 oldlcr;
 327         u8 efr;
 328
 329         oldlcr = inb(baseio + UART_LCR);
 330         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 331
 332         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 333         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 334         efr |= MOXA_MUST_EFR_BANK0;
 335
 336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 337         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
 338         outb(oldlcr, baseio + UART_LCR);
 339 }
 340
 341 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
 342 {
 343         u8 oldlcr;
 344         u8 efr;
 345
 346         oldlcr = inb(baseio + UART_LCR);
 347         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 348
 349         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 350         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 351         efr |= MOXA_MUST_EFR_BANK0;
 352
 353         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 354         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
 355         outb(oldlcr, baseio + UART_LCR);
 356 }
 357
 358 static void mxser_set_must_fifo_value(struct mxser_port *info)
 359 {
 360         u8 oldlcr;
 361         u8 efr;
 362
 363         oldlcr = inb(info->ioaddr + UART_LCR);
 364         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
 365
 366         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
 367         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 368         efr |= MOXA_MUST_EFR_BANK1;
 369
 370         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
 371         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
 372         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
 373         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
 374         outb(oldlcr, info->ioaddr + UART_LCR);
 375 }
 376
 377 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
 378 {
 379         u8 oldlcr;
 380         u8 efr;
 381
 382         oldlcr = inb(baseio + UART_LCR);
 383         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 384
 385         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 386         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 387         efr |= MOXA_MUST_EFR_BANK2;
 388
 389         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 390         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
 391         outb(oldlcr, baseio + UART_LCR);
 392 }
 393
 394 #ifdef CONFIG_PCI
 395 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
 396 {
 397         u8 oldlcr;
 398         u8 efr;
 399
 400         oldlcr = inb(baseio + UART_LCR);
 401         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 402
 403         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 404         efr &= ~MOXA_MUST_EFR_BANK_MASK;
 405         efr |= MOXA_MUST_EFR_BANK2;
 406
 407         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 408         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
 409         outb(oldlcr, baseio + UART_LCR);
 410 }
 411 #endif
 412
 413 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
 414 {
 415         u8 oldlcr;
 416         u8 efr;
 417
 418         oldlcr = inb(baseio + UART_LCR);
 419         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 420
 421         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 422         efr &= ~MOXA_MUST_EFR_SF_MASK;
 423
 424         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 425         outb(oldlcr, baseio + UART_LCR);
 426 }
 427
 428 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
 429 {
 430         u8 oldlcr;
 431         u8 efr;
 432
 433         oldlcr = inb(baseio + UART_LCR);
 434         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 435
 436         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 437         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 438         efr |= MOXA_MUST_EFR_SF_TX1;
 439
 440         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 441         outb(oldlcr, baseio + UART_LCR);
 442 }
 443
 444 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
 445 {
 446         u8 oldlcr;
 447         u8 efr;
 448
 449         oldlcr = inb(baseio + UART_LCR);
 450         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 451
 452         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 453         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
 454
 455         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 456         outb(oldlcr, baseio + UART_LCR);
 457 }
 458
 459 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
 460 {
 461         u8 oldlcr;
 462         u8 efr;
 463
 464         oldlcr = inb(baseio + UART_LCR);
 465         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 466
 467         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 468         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 469         efr |= MOXA_MUST_EFR_SF_RX1;
 470
 471         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 472         outb(oldlcr, baseio + UART_LCR);
 473 }
 474
 475 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
 476 {
 477         u8 oldlcr;
 478         u8 efr;
 479
 480         oldlcr = inb(baseio + UART_LCR);
 481         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
 482
 483         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
 484         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
 485
 486         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
 487         outb(oldlcr, baseio + UART_LCR);
 488 }
 489
 490 #ifdef CONFIG_PCI
 491 static int CheckIsMoxaMust(unsigned long io)
 492 {
 493         u8 oldmcr, hwid;
 494         int i;
 495
 496         outb(0, io + UART_LCR);
 497         mxser_disable_must_enchance_mode(io);
 498         oldmcr = inb(io + UART_MCR);
 499         outb(0, io + UART_MCR);
 500         mxser_set_must_xon1_value(io, 0x11);
 501         if ((hwid = inb(io + UART_MCR)) != 0) {
 502                 outb(oldmcr, io + UART_MCR);
 503                 return MOXA_OTHER_UART;
 504         }
 505
 506         mxser_get_must_hardware_id(io, &hwid);
 507         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
 508                 if (hwid == Gpci_uart_info[i].type)
 509                         return (int)hwid;
 510         }
 511         return MOXA_OTHER_UART;
 512 }
 513 #endif
 514
 515 static void process_txrx_fifo(struct mxser_port *info)
 516 {
 517         int i;
 518
 519         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
 520                 info->rx_trigger = 1;
 521                 info->rx_high_water = 1;
 522                 info->rx_low_water = 1;
 523                 info->xmit_fifo_size = 1;
 524         } else
 525                 for (i = 0; i < UART_INFO_NUM; i++)
 526                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
 527                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
 528                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
 529                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
 530                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
 531                                 break;
 532                         }
 533 }
 534
 535 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
 536 {
 537         static unsigned char mxser_msr[MXSER_PORTS + 1];
 538         unsigned char status = 0;
 539
 540         status = inb(baseaddr + UART_MSR);
 541
 542         mxser_msr[port] &= 0x0F;
 543         mxser_msr[port] |= status;
 544         status = mxser_msr[port];
 545         if (mode)
 546                 mxser_msr[port] = 0;
 547
 548         return status;
 549 }
 550
 551 static int mxser_carrier_raised(struct tty_port *port)
 552 {
 553         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 554         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
 555 }
 556
 557 static void mxser_dtr_rts(struct tty_port *port, int on)
 558 {
 559         struct mxser_port *mp = container_of(port, struct mxser_port, port);
 560         unsigned long flags;
 561
 562         spin_lock_irqsave(&mp->slock, flags);
 563         if (on)
 564                 outb(inb(mp->ioaddr + UART_MCR) |
 565                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
 566         else
 567                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
 568                         mp->ioaddr + UART_MCR);
 569         spin_unlock_irqrestore(&mp->slock, flags);
 570 }
 571
 572 static int mxser_set_baud(struct tty_struct *tty, long newspd)
 573 {
 574         struct mxser_port *info = tty->driver_data;
 575         int quot = 0, baud;
 576         unsigned char cval;
 577
 578         if (!info->ioaddr)
 579                 return -1;
 580
 581         if (newspd > info->max_baud)
 582                 return -1;
 583
 584         if (newspd == 134) {
 585                 quot = 2 * info->baud_base / 269;
 586                 tty_encode_baud_rate(tty, 134, 134);
 587         } else if (newspd) {
 588                 quot = info->baud_base / newspd;
 589                 if (quot == 0)
 590                         quot = 1;
 591                 baud = info->baud_base/quot;
 592                 tty_encode_baud_rate(tty, baud, baud);
 593         } else {
 594                 quot = 0;
 595         }
 596
 597         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
 598         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
 599
 600         if (quot) {
 601                 info->MCR |= UART_MCR_DTR;
 602                 outb(info->MCR, info->ioaddr + UART_MCR);
 603         } else {
 604                 info->MCR &= ~UART_MCR_DTR;
 605                 outb(info->MCR, info->ioaddr + UART_MCR);
 606                 return 0;
 607         }
 608
 609         cval = inb(info->ioaddr + UART_LCR);
 610
 611         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
 612
 613         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
 614         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
 615         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
 616
 617 #ifdef BOTHER
 618         if (C_BAUD(tty) == BOTHER) {
 619                 quot = info->baud_base % newspd;
 620                 quot *= 8;
 621                 if (quot % newspd > newspd / 2) {
 622                         quot /= newspd;
 623                         quot++;
 624                 } else
 625                         quot /= newspd;
 626
 627                 mxser_set_must_enum_value(info->ioaddr, quot);
 628         } else
 629 #endif
 630                 mxser_set_must_enum_value(info->ioaddr, 0);
 631
 632         return 0;
 633 }
 634
 635 /*
 636  * This routine is called to set the UART divisor registers to match
 637  * the specified baud rate for a serial port.
 638  */
 639 static int mxser_change_speed(struct tty_struct *tty)
 640 {
 641         struct mxser_port *info = tty->driver_data;
 642         unsigned cflag, cval, fcr;
 643         int ret = 0;
 644         unsigned char status;
 645
 646         cflag = tty->termios.c_cflag;
 647         if (!info->ioaddr)
 648                 return ret;
 649
 650         if (mxser_set_baud_method[tty->index] == 0)
 651                 mxser_set_baud(tty, tty_get_baud_rate(tty));
 652
 653         /* byte size and parity */
 654         switch (cflag & CSIZE) {
 655         case CS5:
 656                 cval = 0x00;
 657                 break;
 658         case CS6:
 659                 cval = 0x01;
 660                 break;
 661         case CS7:
 662                 cval = 0x02;
 663                 break;
 664         case CS8:
 665                 cval = 0x03;
 666                 break;
 667         default:
 668                 cval = 0x00;
 669                 break;          /* too keep GCC shut... */
 670         }
 671         if (cflag & CSTOPB)
 672                 cval |= 0x04;
 673         if (cflag & PARENB)
 674                 cval |= UART_LCR_PARITY;
 675         if (!(cflag & PARODD))
 676                 cval |= UART_LCR_EPAR;
 677         if (cflag & CMSPAR)
 678                 cval |= UART_LCR_SPAR;
 679
 680         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
 681                 if (info->board->chip_flag) {
 682                         fcr = UART_FCR_ENABLE_FIFO;
 683                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 684                         mxser_set_must_fifo_value(info);
 685                 } else
 686                         fcr = 0;
 687         } else {
 688                 fcr = UART_FCR_ENABLE_FIFO;
 689                 if (info->board->chip_flag) {
 690                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
 691                         mxser_set_must_fifo_value(info);
 692                 } else {
 693                         switch (info->rx_trigger) {
 694                         case 1:
 695                                 fcr |= UART_FCR_TRIGGER_1;
 696                                 break;
 697                         case 4:
 698                                 fcr |= UART_FCR_TRIGGER_4;
 699                                 break;
 700                         case 8:
 701                                 fcr |= UART_FCR_TRIGGER_8;
 702                                 break;
 703                         default:
 704                                 fcr |= UART_FCR_TRIGGER_14;
 705                                 break;
 706                         }
 707                 }
 708         }
 709
 710         /* CTS flow control flag and modem status interrupts */
 711         info->IER &= ~UART_IER_MSI;
 712         info->MCR &= ~UART_MCR_AFE;
 713         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
 714         if (cflag & CRTSCTS) {
 715                 info->IER |= UART_IER_MSI;
 716                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
 717                         info->MCR |= UART_MCR_AFE;
 718                 } else {
 719                         status = inb(info->ioaddr + UART_MSR);
 720                         if (tty->hw_stopped) {
 721                                 if (status & UART_MSR_CTS) {
 722                                         tty->hw_stopped = 0;
 723                                         if (info->type != PORT_16550A &&
 724                                                         !info->board->chip_flag) {
 725                                                 outb(info->IER & ~UART_IER_THRI,
 726                                                         info->ioaddr +
 727                                                         UART_IER);
 728                                                 info->IER |= UART_IER_THRI;
 729                                                 outb(info->IER, info->ioaddr +
 730                                                                 UART_IER);
 731                                         }
 732                                         tty_wakeup(tty);
 733                                 }
 734                         } else {
 735                                 if (!(status & UART_MSR_CTS)) {
 736                                         tty->hw_stopped = 1;
 737                                         if ((info->type != PORT_16550A) &&
 738                                                         (!info->board->chip_flag)) {
 739                                                 info->IER &= ~UART_IER_THRI;
 740                                                 outb(info->IER, info->ioaddr +
 741                                                                 UART_IER);
 742                                         }
 743                                 }
 744                         }
 745                 }
 746         }
 747         outb(info->MCR, info->ioaddr + UART_MCR);
 748         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
 749         if (~cflag & CLOCAL)
 750                 info->IER |= UART_IER_MSI;
 751         outb(info->IER, info->ioaddr + UART_IER);
 752
 753         /*
 754          * Set up parity check flag
 755          */
 756         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
 757         if (I_INPCK(tty))
 758                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 759         if (I_BRKINT(tty) || I_PARMRK(tty))
 760                 info->read_status_mask |= UART_LSR_BI;
 761
 762         info->ignore_status_mask = 0;
 763
 764         if (I_IGNBRK(tty)) {
 765                 info->ignore_status_mask |= UART_LSR_BI;
 766                 info->read_status_mask |= UART_LSR_BI;
 767                 /*
 768                  * If we're ignore parity and break indicators, ignore
 769                  * overruns too.  (For real raw support).
 770                  */
 771                 if (I_IGNPAR(tty)) {
 772                         info->ignore_status_mask |=
 773                                                 UART_LSR_OE |
 774                                                 UART_LSR_PE |
 775                                                 UART_LSR_FE;
 776                         info->read_status_mask |=
 777                                                 UART_LSR_OE |
 778                                                 UART_LSR_PE |
 779                                                 UART_LSR_FE;
 780                 }
 781         }
 782         if (info->board->chip_flag) {
 783                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
 784                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
 785                 if (I_IXON(tty)) {
 786                         mxser_enable_must_rx_software_flow_control(
 787                                         info->ioaddr);
 788                 } else {
 789                         mxser_disable_must_rx_software_flow_control(
 790                                         info->ioaddr);
 791                 }
 792                 if (I_IXOFF(tty)) {
 793                         mxser_enable_must_tx_software_flow_control(
 794                                         info->ioaddr);
 795                 } else {
 796                         mxser_disable_must_tx_software_flow_control(
 797                                         info->ioaddr);
 798                 }
 799         }
 800
 801
 802         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
 803         outb(cval, info->ioaddr + UART_LCR);
 804
 805         return ret;
 806 }
 807
 808 static void mxser_check_modem_status(struct tty_struct *tty,
 809                                 struct mxser_port *port, int status)
 810 {
 811         /* update input line counters */
 812         if (status & UART_MSR_TERI)
 813                 port->icount.rng++;
 814         if (status & UART_MSR_DDSR)
 815                 port->icount.dsr++;
 816         if (status & UART_MSR_DDCD)
 817                 port->icount.dcd++;
 818         if (status & UART_MSR_DCTS)
 819                 port->icount.cts++;
 820         port->mon_data.modem_status = status;
 821         wake_up_interruptible(&port->port.delta_msr_wait);
 822
 823         if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
 824                 if (status & UART_MSR_DCD)
 825                         wake_up_interruptible(&port->port.open_wait);
 826         }
 827
 828         if (tty_port_cts_enabled(&port->port)) {
 829                 if (tty->hw_stopped) {
 830                         if (status & UART_MSR_CTS) {
 831                                 tty->hw_stopped = 0;
 832
 833                                 if ((port->type != PORT_16550A) &&
 834                                                 (!port->board->chip_flag)) {
 835                                         outb(port->IER & ~UART_IER_THRI,
 836                                                 port->ioaddr + UART_IER);
 837                                         port->IER |= UART_IER_THRI;
 838                                         outb(port->IER, port->ioaddr +
 839                                                         UART_IER);
 840                                 }
 841                                 tty_wakeup(tty);
 842                         }
 843                 } else {
 844                         if (!(status & UART_MSR_CTS)) {
 845                                 tty->hw_stopped = 1;
 846                                 if (port->type != PORT_16550A &&
 847                                                 !port->board->chip_flag) {
 848                                         port->IER &= ~UART_IER_THRI;
 849                                         outb(port->IER, port->ioaddr +
 850                                                         UART_IER);
 851                                 }
 852                         }
 853                 }
 854         }
 855 }
 856
 857 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 858 {
 859         struct mxser_port *info = container_of(port, struct mxser_port, port);
 860         unsigned long page;
 861         unsigned long flags;
 862
 863         page = __get_free_page(GFP_KERNEL);
 864         if (!page)
 865                 return -ENOMEM;
 866
 867         spin_lock_irqsave(&info->slock, flags);
 868
 869         if (!info->ioaddr || !info->type) {
 870                 set_bit(TTY_IO_ERROR, &tty->flags);
 871                 free_page(page);
 872                 spin_unlock_irqrestore(&info->slock, flags);
 873                 return 0;
 874         }
 875         info->port.xmit_buf = (unsigned char *) page;
 876
 877         /*
 878          * Clear the FIFO buffers and disable them
 879          * (they will be reenabled in mxser_change_speed())
 880          */
 881         if (info->board->chip_flag)
 882                 outb((UART_FCR_CLEAR_RCVR |
 883                         UART_FCR_CLEAR_XMIT |
 884                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
 885         else
 886                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
 887                         info->ioaddr + UART_FCR);
 888
 889         /*
 890          * At this point there's no way the LSR could still be 0xFF;
 891          * if it is, then bail out, because there's likely no UART
 892          * here.
 893          */
 894         if (inb(info->ioaddr + UART_LSR) == 0xff) {
 895                 spin_unlock_irqrestore(&info->slock, flags);
 896                 if (capable(CAP_SYS_ADMIN)) {
 897                         set_bit(TTY_IO_ERROR, &tty->flags);
 898                         return 0;
 899                 } else
 900                         return -ENODEV;
 901         }
 902
 903         /*
 904          * Clear the interrupt registers.
 905          */
 906         (void) inb(info->ioaddr + UART_LSR);
 907         (void) inb(info->ioaddr + UART_RX);
 908         (void) inb(info->ioaddr + UART_IIR);
 909         (void) inb(info->ioaddr + UART_MSR);
 910
 911         /*
 912          * Now, initialize the UART
 913          */
 914         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
 915         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
 916         outb(info->MCR, info->ioaddr + UART_MCR);
 917
 918         /*
 919          * Finally, enable interrupts
 920          */
 921         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
 922
 923         if (info->board->chip_flag)
 924                 info->IER |= MOXA_MUST_IER_EGDAI;
 925         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
 926
 927         /*
 928          * And clear the interrupt registers again for luck.
 929          */
 930         (void) inb(info->ioaddr + UART_LSR);
 931         (void) inb(info->ioaddr + UART_RX);
 932         (void) inb(info->ioaddr + UART_IIR);
 933         (void) inb(info->ioaddr + UART_MSR);
 934
 935         clear_bit(TTY_IO_ERROR, &tty->flags);
 936         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 937
 938         /*
 939          * and set the speed of the serial port
 940          */
 941         mxser_change_speed(tty);
 942         spin_unlock_irqrestore(&info->slock, flags);
 943
 944         return 0;
 945 }
 946
 947 /*
 948  * This routine will shutdown a serial port
 949  */
 950 static void mxser_shutdown_port(struct tty_port *port)
 951 {
 952         struct mxser_port *info = container_of(port, struct mxser_port, port);
 953         unsigned long flags;
 954
 955         spin_lock_irqsave(&info->slock, flags);
 956
 957         /*
 958          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 959          * here so the queue might never be waken up
 960          */
 961         wake_up_interruptible(&info->port.delta_msr_wait);
 962
 963         /*
 964          * Free the xmit buffer, if necessary
 965          */
 966         if (info->port.xmit_buf) {
 967                 free_page((unsigned long) info->port.xmit_buf);
 968                 info->port.xmit_buf = NULL;
 969         }
 970
 971         info->IER = 0;
 972         outb(0x00, info->ioaddr + UART_IER);
 973
 974         /* clear Rx/Tx FIFO's */
 975         if (info->board->chip_flag)
 976                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
 977                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
 978                                 info->ioaddr + UART_FCR);
 979         else
 980                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 981                         info->ioaddr + UART_FCR);
 982
 983         /* read data port to reset things */
 984         (void) inb(info->ioaddr + UART_RX);
 985
 986
 987         if (info->board->chip_flag)
 988                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
 989
 990         spin_unlock_irqrestore(&info->slock, flags);
 991 }
 992
 993 /*
 994  * This routine is called whenever a serial port is opened.  It
 995  * enables interrupts for a serial port, linking in its async structure into
 996  * the IRQ chain.   It also performs the serial-specific
 997  * initialization for the tty structure.
 998  */
 999 static int mxser_open(struct tty_struct *tty, struct file *filp)
1000 {
1001         struct mxser_port *info;
1002         int line;
1003
1004         line = tty->index;
1005         if (line == MXSER_PORTS)
1006                 return 0;
1007         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1008         if (!info->ioaddr)
1009                 return -ENODEV;
1010
1011         tty->driver_data = info;
1012         return tty_port_open(&info->port, tty, filp);
1013 }
1014
1015 static void mxser_flush_buffer(struct tty_struct *tty)
1016 {
1017         struct mxser_port *info = tty->driver_data;
1018         char fcr;
1019         unsigned long flags;
1020
1021
1022         spin_lock_irqsave(&info->slock, flags);
1023         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1024
1025         fcr = inb(info->ioaddr + UART_FCR);
1026         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1027                 info->ioaddr + UART_FCR);
1028         outb(fcr, info->ioaddr + UART_FCR);
1029
1030         spin_unlock_irqrestore(&info->slock, flags);
1031
1032         tty_wakeup(tty);
1033 }
1034
1035
1036 static void mxser_close_port(struct tty_port *port)
1037 {
1038         struct mxser_port *info = container_of(port, struct mxser_port, port);
1039         unsigned long timeout;
1040         /*
1041          * At this point we stop accepting input.  To do this, we
1042          * disable the receive line status interrupts, and tell the
1043          * interrupt driver to stop checking the data ready bit in the
1044          * line status register.
1045          */
1046         info->IER &= ~UART_IER_RLSI;
1047         if (info->board->chip_flag)
1048                 info->IER &= ~MOXA_MUST_RECV_ISR;
1049
1050         outb(info->IER, info->ioaddr + UART_IER);
1051         /*
1052          * Before we drop DTR, make sure the UART transmitter
1053          * has completely drained; this is especially
1054          * important if there is a transmit FIFO!
1055          */
1056         timeout = jiffies + HZ;
1057         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1058                 schedule_timeout_interruptible(5);
1059                 if (time_after(jiffies, timeout))
1060                         break;
1061         }
1062 }
1063
1064 /*
1065  * This routine is called when the serial port gets closed.  First, we
1066  * wait for the last remaining data to be sent.  Then, we unlink its
1067  * async structure from the interrupt chain if necessary, and we free
1068  * that IRQ if nothing is left in the chain.
1069  */
1070 static void mxser_close(struct tty_struct *tty, struct file *filp)
1071 {
1072         struct mxser_port *info = tty->driver_data;
1073         struct tty_port *port = &info->port;
1074
1075         if (tty->index == MXSER_PORTS || info == NULL)
1076                 return;
1077         if (tty_port_close_start(port, tty, filp) == 0)
1078                 return;
1079         info->closing = 1;
1080         mutex_lock(&port->mutex);
1081         mxser_close_port(port);
1082         mxser_flush_buffer(tty);
1083         if (tty_port_initialized(port) && C_HUPCL(tty))
1084                 tty_port_lower_dtr_rts(port);
1085         mxser_shutdown_port(port);
1086         tty_port_set_initialized(port, 0);
1087         mutex_unlock(&port->mutex);
1088         info->closing = 0;
1089         /* Right now the tty_port set is done outside of the close_end helper
1090            as we don't yet have everyone using refcounts */
1091         tty_port_close_end(port, tty);
1092         tty_port_tty_set(port, NULL);
1093 }
1094
1095 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1096 {
1097         int c, total = 0;
1098         struct mxser_port *info = tty->driver_data;
1099         unsigned long flags;
1100
1101         if (!info->port.xmit_buf)
1102                 return 0;
1103
1104         while (1) {
1105                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1106                                           SERIAL_XMIT_SIZE - info->xmit_head));
1107                 if (c <= 0)
1108                         break;
1109
1110                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1111                 spin_lock_irqsave(&info->slock, flags);
1112                 info->xmit_head = (info->xmit_head + c) &
1113                                   (SERIAL_XMIT_SIZE - 1);
1114                 info->xmit_cnt += c;
1115                 spin_unlock_irqrestore(&info->slock, flags);
1116
1117                 buf += c;
1118                 count -= c;
1119                 total += c;
1120         }
1121
1122         if (info->xmit_cnt && !tty->stopped) {
1123                 if (!tty->hw_stopped ||
1124                                 (info->type == PORT_16550A) ||
1125                                 (info->board->chip_flag)) {
1126                         spin_lock_irqsave(&info->slock, flags);
1127                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1128                                         UART_IER);
1129                         info->IER |= UART_IER_THRI;
1130                         outb(info->IER, info->ioaddr + UART_IER);
1131                         spin_unlock_irqrestore(&info->slock, flags);
1132                 }
1133         }
1134         return total;
1135 }
1136
1137 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1138 {
1139         struct mxser_port *info = tty->driver_data;
1140         unsigned long flags;
1141
1142         if (!info->port.xmit_buf)
1143                 return 0;
1144
1145         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1146                 return 0;
1147
1148         spin_lock_irqsave(&info->slock, flags);
1149         info->port.xmit_buf[info->xmit_head++] = ch;
1150         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1151         info->xmit_cnt++;
1152         spin_unlock_irqrestore(&info->slock, flags);
1153         if (!tty->stopped) {
1154                 if (!tty->hw_stopped ||
1155                                 (info->type == PORT_16550A) ||
1156                                 info->board->chip_flag) {
1157                         spin_lock_irqsave(&info->slock, flags);
1158                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1159                         info->IER |= UART_IER_THRI;
1160                         outb(info->IER, info->ioaddr + UART_IER);
1161                         spin_unlock_irqrestore(&info->slock, flags);
1162                 }
1163         }
1164         return 1;
1165 }
1166
1167
1168 static void mxser_flush_chars(struct tty_struct *tty)
1169 {
1170         struct mxser_port *info = tty->driver_data;
1171         unsigned long flags;
1172
1173         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1174                         (tty->hw_stopped && info->type != PORT_16550A &&
1175                          !info->board->chip_flag))
1176                 return;
1177
1178         spin_lock_irqsave(&info->slock, flags);
1179
1180         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1181         info->IER |= UART_IER_THRI;
1182         outb(info->IER, info->ioaddr + UART_IER);
1183
1184         spin_unlock_irqrestore(&info->slock, flags);
1185 }
1186
1187 static int mxser_write_room(struct tty_struct *tty)
1188 {
1189         struct mxser_port *info = tty->driver_data;
1190         int ret;
1191
1192         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1193         return ret < 0 ? 0 : ret;
1194 }
1195
1196 static int mxser_chars_in_buffer(struct tty_struct *tty)
1197 {
1198         struct mxser_port *info = tty->driver_data;
1199         return info->xmit_cnt;
1200 }
1201
1202 /*
1203  * ------------------------------------------------------------
1204  * friends of mxser_ioctl()
1205  * ------------------------------------------------------------
1206  */
1207 static int mxser_get_serial_info(struct tty_struct *tty,
1208                 struct serial_struct __user *retinfo)
1209 {
1210         struct mxser_port *info = tty->driver_data;
1211         struct serial_struct tmp = {
1212                 .type = info->type,
1213                 .line = tty->index,
1214                 .port = info->ioaddr,
1215                 .irq = info->board->irq,
1216                 .flags = info->port.flags,
1217                 .baud_base = info->baud_base,
1218                 .close_delay = info->port.close_delay,
1219                 .closing_wait = info->port.closing_wait,
1220                 .custom_divisor = info->custom_divisor,
1221         };
1222         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1223                 return -EFAULT;
1224         return 0;
1225 }
1226
1227 static int mxser_set_serial_info(struct tty_struct *tty,
1228                 struct serial_struct __user *new_info)
1229 {
1230         struct mxser_port *info = tty->driver_data;
1231         struct tty_port *port = &info->port;
1232         struct serial_struct new_serial;
1233         speed_t baud;
1234         unsigned long sl_flags;
1235         unsigned int flags;
1236         int retval = 0;
1237
1238         if (!new_info || !info->ioaddr)
1239                 return -ENODEV;
1240         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1241                 return -EFAULT;
1242
1243         if (new_serial.irq != info->board->irq ||
1244                         new_serial.port != info->ioaddr)
1245                 return -EINVAL;
1246
1247         flags = port->flags & ASYNC_SPD_MASK;
1248
1249         if (!capable(CAP_SYS_ADMIN)) {
1250                 if ((new_serial.baud_base != info->baud_base) ||
1251                                 (new_serial.close_delay != info->port.close_delay) ||
1252                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1253                         return -EPERM;
1254                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1255                                 (new_serial.flags & ASYNC_USR_MASK));
1256         } else {
1257                 /*
1258                  * OK, past this point, all the error checking has been done.
1259                  * At this point, we start making changes.....
1260                  */
1261                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1262                                 (new_serial.flags & ASYNC_FLAGS));
1263                 port->close_delay = new_serial.close_delay * HZ / 100;
1264                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1265                 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1266                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1267                                 (new_serial.baud_base != info->baud_base ||
1268                                 new_serial.custom_divisor !=
1269                                 info->custom_divisor)) {
1270                         if (new_serial.custom_divisor == 0)
1271                                 return -EINVAL;
1272                         baud = new_serial.baud_base / new_serial.custom_divisor;
1273                         tty_encode_baud_rate(tty, baud, baud);
1274                 }
1275         }
1276
1277         info->type = new_serial.type;
1278
1279         process_txrx_fifo(info);
1280
1281         if (tty_port_initialized(port)) {
1282                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1283                         spin_lock_irqsave(&info->slock, sl_flags);
1284                         mxser_change_speed(tty);
1285                         spin_unlock_irqrestore(&info->slock, sl_flags);
1286                 }
1287         } else {
1288                 retval = mxser_activate(port, tty);
1289                 if (retval == 0)
1290                         tty_port_set_initialized(port, 1);
1291         }
1292         return retval;
1293 }
1294
1295 /*
1296  * mxser_get_lsr_info - get line status register info
1297  *
1298  * Purpose: Let user call ioctl() to get info when the UART physically
1299  *          is emptied.  On bus types like RS485, the transmitter must
1300  *          release the bus after transmitting. This must be done when
1301  *          the transmit shift register is empty, not be done when the
1302  *          transmit holding register is empty.  This functionality
1303  *          allows an RS485 driver to be written in user space.
1304  */
1305 static int mxser_get_lsr_info(struct mxser_port *info,
1306                 unsigned int __user *value)
1307 {
1308         unsigned char status;
1309         unsigned int result;
1310         unsigned long flags;
1311
1312         spin_lock_irqsave(&info->slock, flags);
1313         status = inb(info->ioaddr + UART_LSR);
1314         spin_unlock_irqrestore(&info->slock, flags);
1315         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1316         return put_user(result, value);
1317 }
1318
1319 static int mxser_tiocmget(struct tty_struct *tty)
1320 {
1321         struct mxser_port *info = tty->driver_data;
1322         unsigned char control, status;
1323         unsigned long flags;
1324
1325
1326         if (tty->index == MXSER_PORTS)
1327                 return -ENOIOCTLCMD;
1328         if (tty_io_error(tty))
1329                 return -EIO;
1330
1331         control = info->MCR;
1332
1333         spin_lock_irqsave(&info->slock, flags);
1334         status = inb(info->ioaddr + UART_MSR);
1335         if (status & UART_MSR_ANY_DELTA)
1336                 mxser_check_modem_status(tty, info, status);
1337         spin_unlock_irqrestore(&info->slock, flags);
1338         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1339                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1340                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1341                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1342                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1343                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1344 }
1345
1346 static int mxser_tiocmset(struct tty_struct *tty,
1347                 unsigned int set, unsigned int clear)
1348 {
1349         struct mxser_port *info = tty->driver_data;
1350         unsigned long flags;
1351
1352
1353         if (tty->index == MXSER_PORTS)
1354                 return -ENOIOCTLCMD;
1355         if (tty_io_error(tty))
1356                 return -EIO;
1357
1358         spin_lock_irqsave(&info->slock, flags);
1359
1360         if (set & TIOCM_RTS)
1361                 info->MCR |= UART_MCR_RTS;
1362         if (set & TIOCM_DTR)
1363                 info->MCR |= UART_MCR_DTR;
1364
1365         if (clear & TIOCM_RTS)
1366                 info->MCR &= ~UART_MCR_RTS;
1367         if (clear & TIOCM_DTR)
1368                 info->MCR &= ~UART_MCR_DTR;
1369
1370         outb(info->MCR, info->ioaddr + UART_MCR);
1371         spin_unlock_irqrestore(&info->slock, flags);
1372         return 0;
1373 }
1374
1375 static int __init mxser_program_mode(int port)
1376 {
1377         int id, i, j, n;
1378
1379         outb(0, port);
1380         outb(0, port);
1381         outb(0, port);
1382         (void)inb(port);
1383         (void)inb(port);
1384         outb(0, port);
1385         (void)inb(port);
1386
1387         id = inb(port + 1) & 0x1F;
1388         if ((id != C168_ASIC_ID) &&
1389                         (id != C104_ASIC_ID) &&
1390                         (id != C102_ASIC_ID) &&
1391                         (id != CI132_ASIC_ID) &&
1392                         (id != CI134_ASIC_ID) &&
1393                         (id != CI104J_ASIC_ID))
1394                 return -1;
1395         for (i = 0, j = 0; i < 4; i++) {
1396                 n = inb(port + 2);
1397                 if (n == 'M') {
1398                         j = 1;
1399                 } else if ((j == 1) && (n == 1)) {
1400                         j = 2;
1401                         break;
1402                 } else
1403                         j = 0;
1404         }
1405         if (j != 2)
1406                 id = -2;
1407         return id;
1408 }
1409
1410 static void __init mxser_normal_mode(int port)
1411 {
1412         int i, n;
1413
1414         outb(0xA5, port + 1);
1415         outb(0x80, port + 3);
1416         outb(12, port + 0);     /* 9600 bps */
1417         outb(0, port + 1);
1418         outb(0x03, port + 3);   /* 8 data bits */
1419         outb(0x13, port + 4);   /* loop back mode */
1420         for (i = 0; i < 16; i++) {
1421                 n = inb(port + 5);
1422                 if ((n & 0x61) == 0x60)
1423                         break;
1424                 if ((n & 1) == 1)
1425                         (void)inb(port);
1426         }
1427         outb(0x00, port + 4);
1428 }
1429
1430 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1431 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1432 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1433 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1434 #define EN_CCMD         0x000   /* Chip's command register     */
1435 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1436 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1437 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1438 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1439 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1440 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1441 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1442 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1443 static int __init mxser_read_register(int port, unsigned short *regs)
1444 {
1445         int i, k, value, id;
1446         unsigned int j;
1447
1448         id = mxser_program_mode(port);
1449         if (id < 0)
1450                 return id;
1451         for (i = 0; i < 14; i++) {
1452                 k = (i & 0x3F) | 0x180;
1453                 for (j = 0x100; j > 0; j >>= 1) {
1454                         outb(CHIP_CS, port);
1455                         if (k & j) {
1456                                 outb(CHIP_CS | CHIP_DO, port);
1457                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1458                         } else {
1459                                 outb(CHIP_CS, port);
1460                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1461                         }
1462                 }
1463                 (void)inb(port);
1464                 value = 0;
1465                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1466                         outb(CHIP_CS, port);
1467                         outb(CHIP_CS | CHIP_SK, port);
1468                         if (inb(port) & CHIP_DI)
1469                                 value |= j;
1470                 }
1471                 regs[i] = value;
1472                 outb(0, port);
1473         }
1474         mxser_normal_mode(port);
1475         return id;
1476 }
1477
1478 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1479 {
1480         struct mxser_port *ip;
1481         struct tty_port *port;
1482         struct tty_struct *tty;
1483         int result, status;
1484         unsigned int i, j;
1485         int ret = 0;
1486
1487         switch (cmd) {
1488         case MOXA_GET_MAJOR:
1489                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1490                                         "%x (GET_MAJOR), fix your userspace\n",
1491                                         current->comm, cmd);
1492                 return put_user(ttymajor, (int __user *)argp);
1493
1494         case MOXA_CHKPORTENABLE:
1495                 result = 0;
1496                 for (i = 0; i < MXSER_BOARDS; i++)
1497                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1498                                 if (mxser_boards[i].ports[j].ioaddr)
1499                                         result |= (1 << i);
1500                 return put_user(result, (unsigned long __user *)argp);
1501         case MOXA_GETDATACOUNT:
1502                 /* The receive side is locked by port->slock but it isn't
1503                    clear that an exact snapshot is worth copying here */
1504                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1505                         ret = -EFAULT;
1506                 return ret;
1507         case MOXA_GETMSTATUS: {
1508                 struct mxser_mstatus ms, __user *msu = argp;
1509                 for (i = 0; i < MXSER_BOARDS; i++)
1510                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1511                                 ip = &mxser_boards[i].ports[j];
1512                                 port = &ip->port;
1513                                 memset(&ms, 0, sizeof(ms));
1514
1515                                 mutex_lock(&port->mutex);
1516                                 if (!ip->ioaddr)
1517                                         goto copy;
1518
1519                                 tty = tty_port_tty_get(port);
1520
1521                                 if (!tty)
1522                                         ms.cflag = ip->normal_termios.c_cflag;
1523                                 else
1524                                         ms.cflag = tty->termios.c_cflag;
1525                                 tty_kref_put(tty);
1526                                 spin_lock_irq(&ip->slock);
1527                                 status = inb(ip->ioaddr + UART_MSR);
1528                                 spin_unlock_irq(&ip->slock);
1529                                 if (status & UART_MSR_DCD)
1530                                         ms.dcd = 1;
1531                                 if (status & UART_MSR_DSR)
1532                                         ms.dsr = 1;
1533                                 if (status & UART_MSR_CTS)
1534                                         ms.cts = 1;
1535                         copy:
1536                                 mutex_unlock(&port->mutex);
1537                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1538                                         return -EFAULT;
1539                                 msu++;
1540                         }
1541                 return 0;
1542         }
1543         case MOXA_ASPP_MON_EXT: {
1544                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1545                 unsigned int cflag, iflag, p;
1546                 u8 opmode;
1547
1548                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1549                 if (!me)
1550                         return -ENOMEM;
1551
1552                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1553                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1554                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1555                                         i = MXSER_BOARDS;
1556                                         break;
1557                                 }
1558                                 ip = &mxser_boards[i].ports[j];
1559                                 port = &ip->port;
1560
1561                                 mutex_lock(&port->mutex);
1562                                 if (!ip->ioaddr) {
1563                                         mutex_unlock(&port->mutex);
1564                                         continue;
1565                                 }
1566
1567                                 spin_lock_irq(&ip->slock);
1568                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1569
1570                                 if (status & UART_MSR_TERI)
1571                                         ip->icount.rng++;
1572                                 if (status & UART_MSR_DDSR)
1573                                         ip->icount.dsr++;
1574                                 if (status & UART_MSR_DDCD)
1575                                         ip->icount.dcd++;
1576                                 if (status & UART_MSR_DCTS)
1577                                         ip->icount.cts++;
1578
1579                                 ip->mon_data.modem_status = status;
1580                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1581                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1582                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1583                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1584                                 me->modem_status[p] =
1585                                         ip->mon_data.modem_status;
1586                                 spin_unlock_irq(&ip->slock);
1587
1588                                 tty = tty_port_tty_get(&ip->port);
1589
1590                                 if (!tty) {
1591                                         cflag = ip->normal_termios.c_cflag;
1592                                         iflag = ip->normal_termios.c_iflag;
1593                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1594                                 } else {
1595                                         cflag = tty->termios.c_cflag;
1596                                         iflag = tty->termios.c_iflag;
1597                                         me->baudrate[p] = tty_get_baud_rate(tty);
1598                                 }
1599                                 tty_kref_put(tty);
1600
1601                                 me->databits[p] = cflag & CSIZE;
1602                                 me->stopbits[p] = cflag & CSTOPB;
1603                                 me->parity[p] = cflag & (PARENB | PARODD |
1604                                                 CMSPAR);
1605
1606                                 if (cflag & CRTSCTS)
1607                                         me->flowctrl[p] |= 0x03;
1608
1609                                 if (iflag & (IXON | IXOFF))
1610                                         me->flowctrl[p] |= 0x0C;
1611
1612                                 if (ip->type == PORT_16550A)
1613                                         me->fifo[p] = 1;
1614
1615                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1616                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1617                                         opmode &= OP_MODE_MASK;
1618                                 } else {
1619                                         opmode = RS232_MODE;
1620                                 }
1621                                 me->iftype[p] = opmode;
1622                                 mutex_unlock(&port->mutex);
1623                         }
1624                 }
1625                 if (copy_to_user(argp, me, sizeof(*me)))
1626                         ret = -EFAULT;
1627                 kfree(me);
1628                 return ret;
1629         }
1630         default:
1631                 return -ENOIOCTLCMD;
1632         }
1633         return 0;
1634 }
1635
1636 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1637                 struct async_icount *cprev)
1638 {
1639         struct async_icount cnow;
1640         unsigned long flags;
1641         int ret;
1642
1643         spin_lock_irqsave(&info->slock, flags);
1644         cnow = info->icount;    /* atomic copy */
1645         spin_unlock_irqrestore(&info->slock, flags);
1646
1647         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1648                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1649                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1650                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1651
1652         *cprev = cnow;
1653
1654         return ret;
1655 }
1656
1657 static int mxser_ioctl(struct tty_struct *tty,
1658                 unsigned int cmd, unsigned long arg)
1659 {
1660         struct mxser_port *info = tty->driver_data;
1661         struct tty_port *port = &info->port;
1662         struct async_icount cnow;
1663         unsigned long flags;
1664         void __user *argp = (void __user *)arg;
1665         int retval;
1666
1667         if (tty->index == MXSER_PORTS)
1668                 return mxser_ioctl_special(cmd, argp);
1669
1670         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1671                 int p;
1672                 unsigned long opmode;
1673                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1674                 int shiftbit;
1675                 unsigned char val, mask;
1676
1677                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1678                         return -EFAULT;
1679
1680                 p = tty->index % 4;
1681                 if (cmd == MOXA_SET_OP_MODE) {
1682                         if (get_user(opmode, (int __user *) argp))
1683                                 return -EFAULT;
1684                         if (opmode != RS232_MODE &&
1685                                         opmode != RS485_2WIRE_MODE &&
1686                                         opmode != RS422_MODE &&
1687                                         opmode != RS485_4WIRE_MODE)
1688                                 return -EFAULT;
1689                         mask = ModeMask[p];
1690                         shiftbit = p * 2;
1691                         spin_lock_irq(&info->slock);
1692                         val = inb(info->opmode_ioaddr);
1693                         val &= mask;
1694                         val |= (opmode << shiftbit);
1695                         outb(val, info->opmode_ioaddr);
1696                         spin_unlock_irq(&info->slock);
1697                 } else {
1698                         shiftbit = p * 2;
1699                         spin_lock_irq(&info->slock);
1700                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1701                         spin_unlock_irq(&info->slock);
1702                         opmode &= OP_MODE_MASK;
1703                         if (put_user(opmode, (int __user *)argp))
1704                                 return -EFAULT;
1705                 }
1706                 return 0;
1707         }
1708
1709         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && tty_io_error(tty))
1710                 return -EIO;
1711
1712         switch (cmd) {
1713         case TIOCGSERIAL:
1714                 mutex_lock(&port->mutex);
1715                 retval = mxser_get_serial_info(tty, argp);
1716                 mutex_unlock(&port->mutex);
1717                 return retval;
1718         case TIOCSSERIAL:
1719                 mutex_lock(&port->mutex);
1720                 retval = mxser_set_serial_info(tty, argp);
1721                 mutex_unlock(&port->mutex);
1722                 return retval;
1723         case TIOCSERGETLSR:     /* Get line status register */
1724                 return  mxser_get_lsr_info(info, argp);
1725                 /*
1726                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1727                  * - mask passed in arg for lines of interest
1728                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1729                  * Caller should use TIOCGICOUNT to see which one it was
1730                  */
1731         case TIOCMIWAIT:
1732                 spin_lock_irqsave(&info->slock, flags);
1733                 cnow = info->icount;    /* note the counters on entry */
1734                 spin_unlock_irqrestore(&info->slock, flags);
1735
1736                 return wait_event_interruptible(info->port.delta_msr_wait,
1737                                 mxser_cflags_changed(info, arg, &cnow));
1738         case MOXA_HighSpeedOn:
1739                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1740         case MOXA_SDS_RSTICOUNTER:
1741                 spin_lock_irq(&info->slock);
1742                 info->mon_data.rxcnt = 0;
1743                 info->mon_data.txcnt = 0;
1744                 spin_unlock_irq(&info->slock);
1745                 return 0;
1746
1747         case MOXA_ASPP_OQUEUE:{
1748                 int len, lsr;
1749
1750                 len = mxser_chars_in_buffer(tty);
1751                 spin_lock_irq(&info->slock);
1752                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1753                 spin_unlock_irq(&info->slock);
1754                 len += (lsr ? 0 : 1);
1755
1756                 return put_user(len, (int __user *)argp);
1757         }
1758         case MOXA_ASPP_MON: {
1759                 int mcr, status;
1760
1761                 spin_lock_irq(&info->slock);
1762                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1763                 mxser_check_modem_status(tty, info, status);
1764
1765                 mcr = inb(info->ioaddr + UART_MCR);
1766                 spin_unlock_irq(&info->slock);
1767
1768                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1769                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1770                 else
1771                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1772
1773                 if (mcr & MOXA_MUST_MCR_TX_XON)
1774                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1775                 else
1776                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1777
1778                 if (tty->hw_stopped)
1779                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1780                 else
1781                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1782
1783                 if (copy_to_user(argp, &info->mon_data,
1784                                 sizeof(struct mxser_mon)))
1785                         return -EFAULT;
1786
1787                 return 0;
1788         }
1789         case MOXA_ASPP_LSTATUS: {
1790                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1791                         return -EFAULT;
1792
1793                 info->err_shadow = 0;
1794                 return 0;
1795         }
1796         case MOXA_SET_BAUD_METHOD: {
1797                 int method;
1798
1799                 if (get_user(method, (int __user *)argp))
1800                         return -EFAULT;
1801                 mxser_set_baud_method[tty->index] = method;
1802                 return put_user(method, (int __user *)argp);
1803         }
1804         default:
1805                 return -ENOIOCTLCMD;
1806         }
1807         return 0;
1808 }
1809
1810         /*
1811          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1812          * Return: write counters to the user passed counter struct
1813          * NB: both 1->0 and 0->1 transitions are counted except for
1814          *     RI where only 0->1 is counted.
1815          */
1816
1817 static int mxser_get_icount(struct tty_struct *tty,
1818                 struct serial_icounter_struct *icount)
1819
1820 {
1821         struct mxser_port *info = tty->driver_data;
1822         struct async_icount cnow;
1823         unsigned long flags;
1824
1825         spin_lock_irqsave(&info->slock, flags);
1826         cnow = info->icount;
1827         spin_unlock_irqrestore(&info->slock, flags);
1828
1829         icount->frame = cnow.frame;
1830         icount->brk = cnow.brk;
1831         icount->overrun = cnow.overrun;
1832         icount->buf_overrun = cnow.buf_overrun;
1833         icount->parity = cnow.parity;
1834         icount->rx = cnow.rx;
1835         icount->tx = cnow.tx;
1836         icount->cts = cnow.cts;
1837         icount->dsr = cnow.dsr;
1838         icount->rng = cnow.rng;
1839         icount->dcd = cnow.dcd;
1840         return 0;
1841 }
1842
1843 static void mxser_stoprx(struct tty_struct *tty)
1844 {
1845         struct mxser_port *info = tty->driver_data;
1846
1847         info->ldisc_stop_rx = 1;
1848         if (I_IXOFF(tty)) {
1849                 if (info->board->chip_flag) {
1850                         info->IER &= ~MOXA_MUST_RECV_ISR;
1851                         outb(info->IER, info->ioaddr + UART_IER);
1852                 } else {
1853                         info->x_char = STOP_CHAR(tty);
1854                         outb(0, info->ioaddr + UART_IER);
1855                         info->IER |= UART_IER_THRI;
1856                         outb(info->IER, info->ioaddr + UART_IER);
1857                 }
1858         }
1859
1860         if (C_CRTSCTS(tty)) {
1861                 info->MCR &= ~UART_MCR_RTS;
1862                 outb(info->MCR, info->ioaddr + UART_MCR);
1863         }
1864 }
1865
1866 /*
1867  * This routine is called by the upper-layer tty layer to signal that
1868  * incoming characters should be throttled.
1869  */
1870 static void mxser_throttle(struct tty_struct *tty)
1871 {
1872         mxser_stoprx(tty);
1873 }
1874
1875 static void mxser_unthrottle(struct tty_struct *tty)
1876 {
1877         struct mxser_port *info = tty->driver_data;
1878
1879         /* startrx */
1880         info->ldisc_stop_rx = 0;
1881         if (I_IXOFF(tty)) {
1882                 if (info->x_char)
1883                         info->x_char = 0;
1884                 else {
1885                         if (info->board->chip_flag) {
1886                                 info->IER |= MOXA_MUST_RECV_ISR;
1887                                 outb(info->IER, info->ioaddr + UART_IER);
1888                         } else {
1889                                 info->x_char = START_CHAR(tty);
1890                                 outb(0, info->ioaddr + UART_IER);
1891                                 info->IER |= UART_IER_THRI;
1892                                 outb(info->IER, info->ioaddr + UART_IER);
1893                         }
1894                 }
1895         }
1896
1897         if (C_CRTSCTS(tty)) {
1898                 info->MCR |= UART_MCR_RTS;
1899                 outb(info->MCR, info->ioaddr + UART_MCR);
1900         }
1901 }
1902
1903 /*
1904  * mxser_stop() and mxser_start()
1905  *
1906  * This routines are called before setting or resetting tty->stopped.
1907  * They enable or disable transmitter interrupts, as necessary.
1908  */
1909 static void mxser_stop(struct tty_struct *tty)
1910 {
1911         struct mxser_port *info = tty->driver_data;
1912         unsigned long flags;
1913
1914         spin_lock_irqsave(&info->slock, flags);
1915         if (info->IER & UART_IER_THRI) {
1916                 info->IER &= ~UART_IER_THRI;
1917                 outb(info->IER, info->ioaddr + UART_IER);
1918         }
1919         spin_unlock_irqrestore(&info->slock, flags);
1920 }
1921
1922 static void mxser_start(struct tty_struct *tty)
1923 {
1924         struct mxser_port *info = tty->driver_data;
1925         unsigned long flags;
1926
1927         spin_lock_irqsave(&info->slock, flags);
1928         if (info->xmit_cnt && info->port.xmit_buf) {
1929                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1930                 info->IER |= UART_IER_THRI;
1931                 outb(info->IER, info->ioaddr + UART_IER);
1932         }
1933         spin_unlock_irqrestore(&info->slock, flags);
1934 }
1935
1936 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1937 {
1938         struct mxser_port *info = tty->driver_data;
1939         unsigned long flags;
1940
1941         spin_lock_irqsave(&info->slock, flags);
1942         mxser_change_speed(tty);
1943         spin_unlock_irqrestore(&info->slock, flags);
1944
1945         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1946                 tty->hw_stopped = 0;
1947                 mxser_start(tty);
1948         }
1949
1950         /* Handle sw stopped */
1951         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1952                 tty->stopped = 0;
1953
1954                 if (info->board->chip_flag) {
1955                         spin_lock_irqsave(&info->slock, flags);
1956                         mxser_disable_must_rx_software_flow_control(
1957                                         info->ioaddr);
1958                         spin_unlock_irqrestore(&info->slock, flags);
1959                 }
1960
1961                 mxser_start(tty);
1962         }
1963 }
1964
1965 /*
1966  * mxser_wait_until_sent() --- wait until the transmitter is empty
1967  */
1968 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1969 {
1970         struct mxser_port *info = tty->driver_data;
1971         unsigned long orig_jiffies, char_time;
1972         unsigned long flags;
1973         int lsr;
1974
1975         if (info->type == PORT_UNKNOWN)
1976                 return;
1977
1978         if (info->xmit_fifo_size == 0)
1979                 return;         /* Just in case.... */
1980
1981         orig_jiffies = jiffies;
1982         /*
1983          * Set the check interval to be 1/5 of the estimated time to
1984          * send a single character, and make it at least 1.  The check
1985          * interval should also be less than the timeout.
1986          *
1987          * Note: we have to use pretty tight timings here to satisfy
1988          * the NIST-PCTS.
1989          */
1990         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1991         char_time = char_time / 5;
1992         if (char_time == 0)
1993                 char_time = 1;
1994         if (timeout && timeout < char_time)
1995                 char_time = timeout;
1996         /*
1997          * If the transmitter hasn't cleared in twice the approximate
1998          * amount of time to send the entire FIFO, it probably won't
1999          * ever clear.  This assumes the UART isn't doing flow
2000          * control, which is currently the case.  Hence, if it ever
2001          * takes longer than info->timeout, this is probably due to a
2002          * UART bug of some kind.  So, we clamp the timeout parameter at
2003          * 2*info->timeout.
2004          */
2005         if (!timeout || timeout > 2 * info->timeout)
2006                 timeout = 2 * info->timeout;
2007
2008         spin_lock_irqsave(&info->slock, flags);
2009         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2010                 spin_unlock_irqrestore(&info->slock, flags);
2011                 schedule_timeout_interruptible(char_time);
2012                 spin_lock_irqsave(&info->slock, flags);
2013                 if (signal_pending(current))
2014                         break;
2015                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2016                         break;
2017         }
2018         spin_unlock_irqrestore(&info->slock, flags);
2019         set_current_state(TASK_RUNNING);
2020 }
2021
2022 /*
2023  * This routine is called by tty_hangup() when a hangup is signaled.
2024  */
2025 static void mxser_hangup(struct tty_struct *tty)
2026 {
2027         struct mxser_port *info = tty->driver_data;
2028
2029         mxser_flush_buffer(tty);
2030         tty_port_hangup(&info->port);
2031 }
2032
2033 /*
2034  * mxser_rs_break() --- routine which turns the break handling on or off
2035  */
2036 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2037 {
2038         struct mxser_port *info = tty->driver_data;
2039         unsigned long flags;
2040
2041         spin_lock_irqsave(&info->slock, flags);
2042         if (break_state == -1)
2043                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2044                         info->ioaddr + UART_LCR);
2045         else
2046                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2047                         info->ioaddr + UART_LCR);
2048         spin_unlock_irqrestore(&info->slock, flags);
2049         return 0;
2050 }
2051
2052 static void mxser_receive_chars(struct tty_struct *tty,
2053                                 struct mxser_port *port, int *status)
2054 {
2055         unsigned char ch, gdl;
2056         int ignored = 0;
2057         int cnt = 0;
2058         int recv_room;
2059         int max = 256;
2060
2061         recv_room = tty->receive_room;
2062         if (recv_room == 0 && !port->ldisc_stop_rx)
2063                 mxser_stoprx(tty);
2064         if (port->board->chip_flag != MOXA_OTHER_UART) {
2065
2066                 if (*status & UART_LSR_SPECIAL)
2067                         goto intr_old;
2068                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2069                                 (*status & MOXA_MUST_LSR_RERR))
2070                         goto intr_old;
2071                 if (*status & MOXA_MUST_LSR_RERR)
2072                         goto intr_old;
2073
2074                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2075
2076                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2077                         gdl &= MOXA_MUST_GDL_MASK;
2078                 if (gdl >= recv_room) {
2079                         if (!port->ldisc_stop_rx)
2080                                 mxser_stoprx(tty);
2081                 }
2082                 while (gdl--) {
2083                         ch = inb(port->ioaddr + UART_RX);
2084                         tty_insert_flip_char(&port->port, ch, 0);
2085                         cnt++;
2086                 }
2087                 goto end_intr;
2088         }
2089 intr_old:
2090
2091         do {
2092                 if (max-- < 0)
2093                         break;
2094
2095                 ch = inb(port->ioaddr + UART_RX);
2096                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2097                         outb(0x23, port->ioaddr + UART_FCR);
2098                 *status &= port->read_status_mask;
2099                 if (*status & port->ignore_status_mask) {
2100                         if (++ignored > 100)
2101                                 break;
2102                 } else {
2103                         char flag = 0;
2104                         if (*status & UART_LSR_SPECIAL) {
2105                                 if (*status & UART_LSR_BI) {
2106                                         flag = TTY_BREAK;
2107                                         port->icount.brk++;
2108
2109                                         if (port->port.flags & ASYNC_SAK)
2110                                                 do_SAK(tty);
2111                                 } else if (*status & UART_LSR_PE) {
2112                                         flag = TTY_PARITY;
2113                                         port->icount.parity++;
2114                                 } else if (*status & UART_LSR_FE) {
2115                                         flag = TTY_FRAME;
2116                                         port->icount.frame++;
2117                                 } else if (*status & UART_LSR_OE) {
2118                                         flag = TTY_OVERRUN;
2119                                         port->icount.overrun++;
2120                                 } else
2121                                         flag = TTY_BREAK;
2122                         }
2123                         tty_insert_flip_char(&port->port, ch, flag);
2124                         cnt++;
2125                         if (cnt >= recv_room) {
2126                                 if (!port->ldisc_stop_rx)
2127                                         mxser_stoprx(tty);
2128                                 break;
2129                         }
2130
2131                 }
2132
2133                 if (port->board->chip_flag)
2134                         break;
2135
2136                 *status = inb(port->ioaddr + UART_LSR);
2137         } while (*status & UART_LSR_DR);
2138
2139 end_intr:
2140         mxvar_log.rxcnt[tty->index] += cnt;
2141         port->mon_data.rxcnt += cnt;
2142         port->mon_data.up_rxcnt += cnt;
2143
2144         /*
2145          * We are called from an interrupt context with &port->slock
2146          * being held. Drop it temporarily in order to prevent
2147          * recursive locking.
2148          */
2149         spin_unlock(&port->slock);
2150         tty_flip_buffer_push(&port->port);
2151         spin_lock(&port->slock);
2152 }
2153
2154 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2155 {
2156         int count, cnt;
2157
2158         if (port->x_char) {
2159                 outb(port->x_char, port->ioaddr + UART_TX);
2160                 port->x_char = 0;
2161                 mxvar_log.txcnt[tty->index]++;
2162                 port->mon_data.txcnt++;
2163                 port->mon_data.up_txcnt++;
2164                 port->icount.tx++;
2165                 return;
2166         }
2167
2168         if (port->port.xmit_buf == NULL)
2169                 return;
2170
2171         if (port->xmit_cnt <= 0 || tty->stopped ||
2172                         (tty->hw_stopped &&
2173                         (port->type != PORT_16550A) &&
2174                         (!port->board->chip_flag))) {
2175                 port->IER &= ~UART_IER_THRI;
2176                 outb(port->IER, port->ioaddr + UART_IER);
2177                 return;
2178         }
2179
2180         cnt = port->xmit_cnt;
2181         count = port->xmit_fifo_size;
2182         do {
2183                 outb(port->port.xmit_buf[port->xmit_tail++],
2184                         port->ioaddr + UART_TX);
2185                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2186                 if (--port->xmit_cnt <= 0)
2187                         break;
2188         } while (--count > 0);
2189         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2190
2191         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2192         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2193         port->icount.tx += (cnt - port->xmit_cnt);
2194
2195         if (port->xmit_cnt < WAKEUP_CHARS)
2196                 tty_wakeup(tty);
2197
2198         if (port->xmit_cnt <= 0) {
2199                 port->IER &= ~UART_IER_THRI;
2200                 outb(port->IER, port->ioaddr + UART_IER);
2201         }
2202 }
2203
2204 /*
2205  * This is the serial driver's generic interrupt routine
2206  */
2207 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2208 {
2209         int status, iir, i;
2210         struct mxser_board *brd = NULL;
2211         struct mxser_port *port;
2212         int max, irqbits, bits, msr;
2213         unsigned int int_cnt, pass_counter = 0;
2214         int handled = IRQ_NONE;
2215         struct tty_struct *tty;
2216
2217         for (i = 0; i < MXSER_BOARDS; i++)
2218                 if (dev_id == &mxser_boards[i]) {
2219                         brd = dev_id;
2220                         break;
2221                 }
2222
2223         if (i == MXSER_BOARDS)
2224                 goto irq_stop;
2225         if (brd == NULL)
2226                 goto irq_stop;
2227         max = brd->info->nports;
2228         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2229                 irqbits = inb(brd->vector) & brd->vector_mask;
2230                 if (irqbits == brd->vector_mask)
2231                         break;
2232
2233                 handled = IRQ_HANDLED;
2234                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2235                         if (irqbits == brd->vector_mask)
2236                                 break;
2237                         if (bits & irqbits)
2238                                 continue;
2239                         port = &brd->ports[i];
2240
2241                         int_cnt = 0;
2242                         spin_lock(&port->slock);
2243                         do {
2244                                 iir = inb(port->ioaddr + UART_IIR);
2245                                 if (iir & UART_IIR_NO_INT)
2246                                         break;
2247                                 iir &= MOXA_MUST_IIR_MASK;
2248                                 tty = tty_port_tty_get(&port->port);
2249                                 if (!tty || port->closing ||
2250                                     !tty_port_initialized(&port->port)) {
2251                                         status = inb(port->ioaddr + UART_LSR);
2252                                         outb(0x27, port->ioaddr + UART_FCR);
2253                                         inb(port->ioaddr + UART_MSR);
2254                                         tty_kref_put(tty);
2255                                         break;
2256                                 }
2257
2258                                 status = inb(port->ioaddr + UART_LSR);
2259
2260                                 if (status & UART_LSR_PE)
2261                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2262                                 if (status & UART_LSR_FE)
2263                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2264                                 if (status & UART_LSR_OE)
2265                                         port->err_shadow |=
2266                                                 NPPI_NOTIFY_HW_OVERRUN;
2267                                 if (status & UART_LSR_BI)
2268                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2269
2270                                 if (port->board->chip_flag) {
2271                                         if (iir == MOXA_MUST_IIR_GDA ||
2272                                             iir == MOXA_MUST_IIR_RDA ||
2273                                             iir == MOXA_MUST_IIR_RTO ||
2274                                             iir == MOXA_MUST_IIR_LSR)
2275                                                 mxser_receive_chars(tty, port,
2276                                                                 &status);
2277
2278                                 } else {
2279                                         status &= port->read_status_mask;
2280                                         if (status & UART_LSR_DR)
2281                                                 mxser_receive_chars(tty, port,
2282                                                                 &status);
2283                                 }
2284                                 msr = inb(port->ioaddr + UART_MSR);
2285                                 if (msr & UART_MSR_ANY_DELTA)
2286                                         mxser_check_modem_status(tty, port, msr);
2287
2288                                 if (port->board->chip_flag) {
2289                                         if (iir == 0x02 && (status &
2290                                                                 UART_LSR_THRE))
2291                                                 mxser_transmit_chars(tty, port);
2292                                 } else {
2293                                         if (status & UART_LSR_THRE)
2294                                                 mxser_transmit_chars(tty, port);
2295                                 }
2296                                 tty_kref_put(tty);
2297                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2298                         spin_unlock(&port->slock);
2299                 }
2300         }
2301
2302 irq_stop:
2303         return handled;
2304 }
2305
2306 static const struct tty_operations mxser_ops = {
2307         .open = mxser_open,
2308         .close = mxser_close,
2309         .write = mxser_write,
2310         .put_char = mxser_put_char,
2311         .flush_chars = mxser_flush_chars,
2312         .write_room = mxser_write_room,
2313         .chars_in_buffer = mxser_chars_in_buffer,
2314         .flush_buffer = mxser_flush_buffer,
2315         .ioctl = mxser_ioctl,
2316         .throttle = mxser_throttle,
2317         .unthrottle = mxser_unthrottle,
2318         .set_termios = mxser_set_termios,
2319         .stop = mxser_stop,
2320         .start = mxser_start,
2321         .hangup = mxser_hangup,
2322         .break_ctl = mxser_rs_break,
2323         .wait_until_sent = mxser_wait_until_sent,
2324         .tiocmget = mxser_tiocmget,
2325         .tiocmset = mxser_tiocmset,
2326         .get_icount = mxser_get_icount,
2327 };
2328
2329 static const struct tty_port_operations mxser_port_ops = {
2330         .carrier_raised = mxser_carrier_raised,
2331         .dtr_rts = mxser_dtr_rts,
2332         .activate = mxser_activate,
2333         .shutdown = mxser_shutdown_port,
2334 };
2335
2336 /*
2337  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2338  */
2339
2340 static bool allow_overlapping_vector;
2341 module_param(allow_overlapping_vector, bool, S_IRUGO);
2342 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2343
2344 static bool mxser_overlapping_vector(struct mxser_board *brd)
2345 {
2346         return allow_overlapping_vector &&
2347                 brd->vector >= brd->ports[0].ioaddr &&
2348                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2349 }
2350
2351 static int mxser_request_vector(struct mxser_board *brd)
2352 {
2353         if (mxser_overlapping_vector(brd))
2354                 return 0;
2355         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2356 }
2357
2358 static void mxser_release_vector(struct mxser_board *brd)
2359 {
2360         if (mxser_overlapping_vector(brd))
2361                 return;
2362         release_region(brd->vector, 1);
2363 }
2364
2365 static void mxser_release_ISA_res(struct mxser_board *brd)
2366 {
2367         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2368         mxser_release_vector(brd);
2369 }
2370
2371 static int mxser_initbrd(struct mxser_board *brd)
2372 {
2373         struct mxser_port *info;
2374         unsigned int i;
2375         int retval;
2376
2377         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2378                         brd->ports[0].max_baud);
2379
2380         for (i = 0; i < brd->info->nports; i++) {
2381                 info = &brd->ports[i];
2382                 tty_port_init(&info->port);
2383                 info->port.ops = &mxser_port_ops;
2384                 info->board = brd;
2385                 info->stop_rx = 0;
2386                 info->ldisc_stop_rx = 0;
2387
2388                 /* Enhance mode enabled here */
2389                 if (brd->chip_flag != MOXA_OTHER_UART)
2390                         mxser_enable_must_enchance_mode(info->ioaddr);
2391
2392                 info->type = brd->uart_type;
2393
2394                 process_txrx_fifo(info);
2395
2396                 info->custom_divisor = info->baud_base * 16;
2397                 info->port.close_delay = 5 * HZ / 10;
2398                 info->port.closing_wait = 30 * HZ;
2399                 info->normal_termios = mxvar_sdriver->init_termios;
2400                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2401                 info->err_shadow = 0;
2402                 spin_lock_init(&info->slock);
2403
2404                 /* before set INT ISR, disable all int */
2405                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2406                         info->ioaddr + UART_IER);
2407         }
2408
2409         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2410                         brd);
2411         if (retval) {
2412                 for (i = 0; i < brd->info->nports; i++)
2413                         tty_port_destroy(&brd->ports[i].port);
2414                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2415                         "conflict with another device.\n",
2416                         brd->info->name, brd->irq);
2417         }
2418
2419         return retval;
2420 }
2421
2422 static void mxser_board_remove(struct mxser_board *brd)
2423 {
2424         unsigned int i;
2425
2426         for (i = 0; i < brd->info->nports; i++) {
2427                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2428                 tty_port_destroy(&brd->ports[i].port);
2429         }
2430         free_irq(brd->irq, brd);
2431 }
2432
2433 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2434 {
2435         int id, i, bits, ret;
2436         unsigned short regs[16], irq;
2437         unsigned char scratch, scratch2;
2438
2439         brd->chip_flag = MOXA_OTHER_UART;
2440
2441         id = mxser_read_register(cap, regs);
2442         switch (id) {
2443         case C168_ASIC_ID:
2444                 brd->info = &mxser_cards[0];
2445                 break;
2446         case C104_ASIC_ID:
2447                 brd->info = &mxser_cards[1];
2448                 break;
2449         case CI104J_ASIC_ID:
2450                 brd->info = &mxser_cards[2];
2451                 break;
2452         case C102_ASIC_ID:
2453                 brd->info = &mxser_cards[5];
2454                 break;
2455         case CI132_ASIC_ID:
2456                 brd->info = &mxser_cards[6];
2457                 break;
2458         case CI134_ASIC_ID:
2459                 brd->info = &mxser_cards[7];
2460                 break;
2461         default:
2462                 return 0;
2463         }
2464
2465         irq = 0;
2466         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2467            Flag-hack checks if configuration should be read as 2-port here. */
2468         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2469                 irq = regs[9] & 0xF000;
2470                 irq = irq | (irq >> 4);
2471                 if (irq != (regs[9] & 0xFF00))
2472                         goto err_irqconflict;
2473         } else if (brd->info->nports == 4) {
2474                 irq = regs[9] & 0xF000;
2475                 irq = irq | (irq >> 4);
2476                 irq = irq | (irq >> 8);
2477                 if (irq != regs[9])
2478                         goto err_irqconflict;
2479         } else if (brd->info->nports == 8) {
2480                 irq = regs[9] & 0xF000;
2481                 irq = irq | (irq >> 4);
2482                 irq = irq | (irq >> 8);
2483                 if ((irq != regs[9]) || (irq != regs[10]))
2484                         goto err_irqconflict;
2485         }
2486
2487         if (!irq) {
2488                 printk(KERN_ERR "mxser: interrupt number unset\n");
2489                 return -EIO;
2490         }
2491         brd->irq = ((int)(irq & 0xF000) >> 12);
2492         for (i = 0; i < 8; i++)
2493                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2494         if ((regs[12] & 0x80) == 0) {
2495                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2496                 return -EIO;
2497         }
2498         brd->vector = (int)regs[11];    /* interrupt vector */
2499         if (id == 1)
2500                 brd->vector_mask = 0x00FF;
2501         else
2502                 brd->vector_mask = 0x000F;
2503         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2504                 if (regs[12] & bits) {
2505                         brd->ports[i].baud_base = 921600;
2506                         brd->ports[i].max_baud = 921600;
2507                 } else {
2508                         brd->ports[i].baud_base = 115200;
2509                         brd->ports[i].max_baud = 115200;
2510                 }
2511         }
2512         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2513         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2514         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2515         outb(scratch2, cap + UART_LCR);
2516         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2517         scratch = inb(cap + UART_IIR);
2518
2519         if (scratch & 0xC0)
2520                 brd->uart_type = PORT_16550A;
2521         else
2522                 brd->uart_type = PORT_16450;
2523         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2524                         "mxser(IO)")) {
2525                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2526                                 "0x%.8lx-0x%.8lx\n",
2527                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2528                                 8 * brd->info->nports - 1);
2529                 return -EIO;
2530         }
2531
2532         ret = mxser_request_vector(brd);
2533         if (ret) {
2534                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2535                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2536                                 "0x%.8lx-0x%.8lx\n",
2537                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2538                                 8 * brd->info->nports - 1);
2539                 return ret;
2540         }
2541         return brd->info->nports;
2542
2543 err_irqconflict:
2544         printk(KERN_ERR "mxser: invalid interrupt number\n");
2545         return -EIO;
2546 }
2547
2548 static int mxser_probe(struct pci_dev *pdev,
2549                 const struct pci_device_id *ent)
2550 {
2551 #ifdef CONFIG_PCI
2552         struct mxser_board *brd;
2553         unsigned int i, j;
2554         unsigned long ioaddress;
2555         struct device *tty_dev;
2556         int retval = -EINVAL;
2557
2558         for (i = 0; i < MXSER_BOARDS; i++)
2559                 if (mxser_boards[i].info == NULL)
2560                         break;
2561
2562         if (i >= MXSER_BOARDS) {
2563                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2564                                 "not configured\n", MXSER_BOARDS);
2565                 goto err;
2566         }
2567
2568         brd = &mxser_boards[i];
2569         brd->idx = i * MXSER_PORTS_PER_BOARD;
2570         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2571                 mxser_cards[ent->driver_data].name,
2572                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2573
2574         retval = pci_enable_device(pdev);
2575         if (retval) {
2576                 dev_err(&pdev->dev, "PCI enable failed\n");
2577                 goto err;
2578         }
2579
2580         /* io address */
2581         ioaddress = pci_resource_start(pdev, 2);
2582         retval = pci_request_region(pdev, 2, "mxser(IO)");
2583         if (retval)
2584                 goto err_dis;
2585
2586         brd->info = &mxser_cards[ent->driver_data];
2587         for (i = 0; i < brd->info->nports; i++)
2588                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2589
2590         /* vector */
2591         ioaddress = pci_resource_start(pdev, 3);
2592         retval = pci_request_region(pdev, 3, "mxser(vector)");
2593         if (retval)
2594                 goto err_zero;
2595         brd->vector = ioaddress;
2596
2597         /* irq */
2598         brd->irq = pdev->irq;
2599
2600         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2601         brd->uart_type = PORT_16550A;
2602         brd->vector_mask = 0;
2603
2604         for (i = 0; i < brd->info->nports; i++) {
2605                 for (j = 0; j < UART_INFO_NUM; j++) {
2606                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2607                                 brd->ports[i].max_baud =
2608                                         Gpci_uart_info[j].max_baud;
2609
2610                                 /* exception....CP-102 */
2611                                 if (brd->info->flags & MXSER_HIGHBAUD)
2612                                         brd->ports[i].max_baud = 921600;
2613                                 break;
2614                         }
2615                 }
2616         }
2617
2618         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2619                 for (i = 0; i < brd->info->nports; i++) {
2620                         if (i < 4)
2621                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2622                         else
2623                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2624                 }
2625                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2626                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2627         }
2628
2629         for (i = 0; i < brd->info->nports; i++) {
2630                 brd->vector_mask |= (1 << i);
2631                 brd->ports[i].baud_base = 921600;
2632         }
2633
2634         /* mxser_initbrd will hook ISR. */
2635         retval = mxser_initbrd(brd);
2636         if (retval)
2637                 goto err_rel3;
2638
2639         for (i = 0; i < brd->info->nports; i++) {
2640                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2641                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2642                 if (IS_ERR(tty_dev)) {
2643                         retval = PTR_ERR(tty_dev);
2644                         for (; i > 0; i--)
2645                                 tty_unregister_device(mxvar_sdriver,
2646                                         brd->idx + i - 1);
2647                         goto err_relbrd;
2648                 }
2649         }
2650
2651         pci_set_drvdata(pdev, brd);
2652
2653         return 0;
2654 err_relbrd:
2655         for (i = 0; i < brd->info->nports; i++)
2656                 tty_port_destroy(&brd->ports[i].port);
2657         free_irq(brd->irq, brd);
2658 err_rel3:
2659         pci_release_region(pdev, 3);
2660 err_zero:
2661         brd->info = NULL;
2662         pci_release_region(pdev, 2);
2663 err_dis:
2664         pci_disable_device(pdev);
2665 err:
2666         return retval;
2667 #else
2668         return -ENODEV;
2669 #endif
2670 }
2671
2672 static void mxser_remove(struct pci_dev *pdev)
2673 {
2674 #ifdef CONFIG_PCI
2675         struct mxser_board *brd = pci_get_drvdata(pdev);
2676
2677         mxser_board_remove(brd);
2678
2679         pci_release_region(pdev, 2);
2680         pci_release_region(pdev, 3);
2681         pci_disable_device(pdev);
2682         brd->info = NULL;
2683 #endif
2684 }
2685
2686 static struct pci_driver mxser_driver = {
2687         .name = "mxser",
2688         .id_table = mxser_pcibrds,
2689         .probe = mxser_probe,
2690         .remove = mxser_remove
2691 };
2692
2693 static int __init mxser_module_init(void)
2694 {
2695         struct mxser_board *brd;
2696         struct device *tty_dev;
2697         unsigned int b, i, m;
2698         int retval;
2699
2700         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2701         if (!mxvar_sdriver)
2702                 return -ENOMEM;
2703
2704         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2705                 MXSER_VERSION);
2706
2707         /* Initialize the tty_driver structure */
2708         mxvar_sdriver->name = "ttyMI";
2709         mxvar_sdriver->major = ttymajor;
2710         mxvar_sdriver->minor_start = 0;
2711         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2712         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2713         mxvar_sdriver->init_termios = tty_std_termios;
2714         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2715         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2716         tty_set_operations(mxvar_sdriver, &mxser_ops);
2717
2718         retval = tty_register_driver(mxvar_sdriver);
2719         if (retval) {
2720                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2721                                 "tty driver !\n");
2722                 goto err_put;
2723         }
2724
2725         /* Start finding ISA boards here */
2726         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2727                 if (!ioaddr[b])
2728                         continue;
2729
2730                 brd = &mxser_boards[m];
2731                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2732                 if (retval <= 0) {
2733                         brd->info = NULL;
2734                         continue;
2735                 }
2736
2737                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2738                                 brd->info->name, ioaddr[b]);
2739
2740                 /* mxser_initbrd will hook ISR. */
2741                 if (mxser_initbrd(brd) < 0) {
2742                         mxser_release_ISA_res(brd);
2743                         brd->info = NULL;
2744                         continue;
2745                 }
2746
2747                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2748                 for (i = 0; i < brd->info->nports; i++) {
2749                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2750                                         mxvar_sdriver, brd->idx + i, NULL);
2751                         if (IS_ERR(tty_dev)) {
2752                                 for (; i > 0; i--)
2753                                         tty_unregister_device(mxvar_sdriver,
2754                                                 brd->idx + i - 1);
2755                                 for (i = 0; i < brd->info->nports; i++)
2756                                         tty_port_destroy(&brd->ports[i].port);
2757                                 free_irq(brd->irq, brd);
2758                                 mxser_release_ISA_res(brd);
2759                                 brd->info = NULL;
2760                                 break;
2761                         }
2762                 }
2763                 if (brd->info == NULL)
2764                         continue;
2765
2766                 m++;
2767         }
2768
2769         retval = pci_register_driver(&mxser_driver);
2770         if (retval) {
2771                 printk(KERN_ERR "mxser: can't register pci driver\n");
2772                 if (!m) {
2773                         retval = -ENODEV;
2774                         goto err_unr;
2775                 } /* else: we have some ISA cards under control */
2776         }
2777
2778         return 0;
2779 err_unr:
2780         tty_unregister_driver(mxvar_sdriver);
2781 err_put:
2782         put_tty_driver(mxvar_sdriver);
2783         return retval;
2784 }
2785
2786 static void __exit mxser_module_exit(void)
2787 {
2788         unsigned int i;
2789
2790         pci_unregister_driver(&mxser_driver);
2791
2792         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2793                 if (mxser_boards[i].info != NULL)
2794                         mxser_board_remove(&mxser_boards[i]);
2795         tty_unregister_driver(mxvar_sdriver);
2796         put_tty_driver(mxvar_sdriver);
2797
2798         for (i = 0; i < MXSER_BOARDS; i++)
2799                 if (mxser_boards[i].info != NULL)
2800                         mxser_release_ISA_res(&mxser_boards[i]);
2801 }
2802
2803 module_init(mxser_module_init);
2804 module_exit(mxser_module_exit);